Chemical laboratory apparatus



Sept. 18, 1934. w. OQGEYER I CHEMIAL LABORATORY APPARATUS Filed July 13 1933 I NVEN TOR 71 2 /41 0. GE/E/fii Patented Sept. 18, i f

UNITED STATES; mm oFFicE 1,973,754 CHEMICAL LABORATORY APPARATUS William 0. Geyer, Bloomfield, N. J.

Application July 13, 1933,. Serial No. 680,195 7 4'Claims. (01. 23-259) This invention relates to stop-cocks "and more Referring to the drawing, the three-way stopparticularly to three-way stop-cocks for use in cock of the present invention in the specific emcombination with a source of fluid supply and a bo'diment described therein is comprised essencontainer into which the fluid is to be drawn and tially of glass and consists of a barrel 1, havfrom which it is to be drained through the one ing an inner conicaliy tapered surface and a constop-cock. Still more particularly this invention ically tapered plug 2, adapted to form a tight relates to glass stop-cocks of the three-way type joint therewith. Uponthe outer face of barrel to be used in combination with a graduated tube, 1 are positioned a pair of longitudinally spaced forming thereby chemical apparatus known in conduits 3 'and l extending through the barrel 10 the art as a burette cf the so-called self-filling and opening to the conically tapered inner surtype. face thereof. Upon one of said conduits 4 is posi- One of the objects of the present invention is tioned a container 5 which in the specific to provide an improved three-way stopcock. embodiment is a graduated tube 5 (Fig; 1) com Another object of the present invention is to prising the fluid measuring means or burette and 15 provide an improved self or automatically filling to the other of said conduits 3 is connected the burette. source of fluid supply (not shown) for the said Still another object of the present invention graduated tube 5. It is usual to position the is to generally facilitate the transfer of fluid source of fluid supply at a level above the gradfrom a fluid source to a container and the with uated tube 5 so that a gravity feed therefrom to 20 drawal of said fluid from the container through the conduit 3, to which it is connected, can be a single stop-cock. obtained.

Other objects and advantages Will -be apparent Means are provided in plug 2 to permit fluid as the invention is more fully hereinafter disfrom the supply source (not shown) to flow from closed. Y the spaced conduit 3, to which it is connected, into 25 In accordance with the objectsof the present the otherconduit l, when it is desired to fill the invention I have devised a newtype of three-' graduated tube 5 connected thereto. In accord- Way' stop-cock for use in combination with aahce with the present invention thismeans corngraduated tube or other container whereby the prises a longitudinal groove 6 in the surface of transfer thereto of fluid from a supply source plug 2. having a length adapted to bridge the gap 30 and the withdrawal of fluid from'the container] between'th'e spaced conduits 3 and 4. through a single stop-cock may be greatly iacili- Meansaiso are prcvided'to discharge fluid from. tated. As a specific em'bodiment of the present the graduated tube 5 through the plug 2. This invention I will described the same as it may be means comprises a bore passageway 7 extending utilized in combination with a graduated tube diametrically and angularly through the plug 2,

35 of the type known in the chemical glassware art having one end opening in the groove 6 at a point as a titrating burette whereby an improved bualigning it with the said conduit 3 and the opporette of the self-filling type is obtained. It is site end thereof opening at'the plug surface on not to be construed, however, that I am to be the side opposite to the groove 6 in a position so limited thereby, as the three-way stop-cock of that upon a 180 degree rotation of the plug 2, by

the present invention is adapted to a plurality of means of handle 16, the said opposite end of said uses and applications which will be apparent bore passageway will align with spaced conduit 4. from a description of the specific embodiment Means also are provided to permit the fluid thereof. from graduated tube 5 to discharge through the Before further disclosing the nature and scope barrel 1 when the plug 2 has been so rotated, 45 of the present invention reference should be made which comprises a drain conduit 8 preferably to the accompanying drawing, wherein provided with a capillary tip 9 extending through Fig. l is a side elevational view of the self-fillthe barrel to the innersuriace thereof, which ing burette of the present invention; conduit 8 is located on said barrel 1 diametrically Fig. 2 is a sectional side elevation view showopposite to the pair of conduits 3 and 4 and in subing the stop-cock plug in the re-fill position; stantial alignment with conduit 3.

Fig. 3 is a second view of the same showing the When it is desired to interrupt the flow of fluid stop-cock plug in the discharge position; and either into or out of the graduated tube 5 plug'2 Fig. 4 is a perspective View of the stop-cock may be given a quarter turn rotation in either plug illustrating that feature of the present indirection. 55 t The three-way stop-cock of the present invenllO tion has many advantages over three-way stopcocks of the prior art which have heretofore been used in combination with a graduated tube or burette. In the prior art stop-cocks two bore passageways are provided through the plug 2, one of which serves as a fluid discharge passageway from the graduated tube 5 and the other of which serves as a fluid feed passageway for refilling the said graduated tube 5. In such a type stop-cock the supply conduit had to be positioned on the bottom of the stop-cock adjacent the discharge conduit 8, thereby materially interfering with the use and manipulation of the said stop-cock. The present structure eliminates these disadvantages of such prior art stock-cocks thereby improving the burette of the self or automatically filling type. Whereas, as a specific embodiment, I have described a three-way stop-cock comprised of glass it is apparent that I am not to be limited thereby. Such a stop-cock constructed in accordance with the teachings of the present invention may be comprised of porcelain, metal, or other similar materials heretofore employed in the manufacture of stop cocks without departing essentially from the scope of the present invention.

Whereas, also as a specific embodiment, I have illustrated the combination of the stop-cock with a graduated tube of the burette type, it is also apparent that I am not to be limited thereby. Such a stop-cock as is herein described is adapted for wide commercial use with all types of containers wherein it is desired to transfer fluid from a supply source to the container and to, withdraw fluid from the container through the same stop-cock.

It is apparent therefore that many modifications and adaptations of the specific embodiment of the present invention may be made therein without departing essentially from the nature and scope thereof, but all such modifications and adaptations are contemplated as may fall within the scope of the following claims:-

What is claimed is:

l. A three-way stop-cock comprising a barrel having an inner surface conically tapered from one end of said barrel to the other, a pair of longitudinally spaced conduits on said barrel and opening there through to the inner conical surface thereof, a single conduit positioned on said barrel diametrically to said pair of conduits and having an opening there through diametrically alignedwith the opening of the lower of said pair of conduits, and a conically tapered plug member adapted to seat internally in said barrel, said plug member having a longitudinally extending groove in the surface thereof, said groove being adapted to bridge the openings of said pair of conduits, and a bore passageway extending diametrically there through from the lower end of said groove towards the upper end of said plug and opening at the opposite surface thereof at a point diametrically opposite the upper end of said groove.

2. A three-way stop-cock comprising a barrel section having a conically tapered inner surface, a pair of longitudinally spaced conduits on one side thereof opening through said barrel to the inner surface thereof, a single conduit on the diametrically opposite side of said barrel and opening through said barrel to the inner surface thereof, and a conically tapered plug member for said barrel, said plug member having a longitudinally extending groove in the surface thereof adapted to bridge the gap between the openings of the said pair of conduits on the inner surface of said barrel to provide a passageway there between along the said plug member, and having a bored passageway extending angular-1y and diametrically through the said plug member, from one end of the said groove at a point aligning it with one of the openings of said pair of conduits to a point on the plug surface adapting it to align with the opening of the other of said pair of conduits, when said plug is rotated about its axis approximately 180 degrees, the said single conduit being disposed on said barrel with respect to the said bored passageway to align with the passageway opening in the said groove when the said plug member is in its said rotated position.

3. In combination a three-way stop-cock of the type described and claimed in claim 1, and a container attached to the upper of said pair of conduits and positioned above the said stop-cock,

the lower of said pair of conduits being adapted to be connected to a source of fluid tobe supplied to said container.

4. A self-filling burette comprising in combination a three-way stop-cock of the type described and claimed in claim 1 and agraduated tube attached to the upper of said pair of conduits and positioned above the said stop-cock, the lower of said pair of conduits being adapted to be connected to a source of fluid to be supplied to said graduated tube.

WILLIAM O. GEYER. 

